linux-ext4 - [Bug 42895] jbd2 makes all system unresponsive

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Message-Id: <20120514214340.5B64C11F973@bugzilla.kernel.org>
Date:	Mon, 14 May 2012 21:43:40 +0000 (UTC)
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 42895] jbd2 makes all system unresponsive

https://bugzilla.kernel.org/show_bug.cgi?id=42895


Jan Kara <jack@...e.cz> changed:

           What    |Removed                     |Added
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                 CC|                            |jack@...e.cz




--- Comment #10 from Jan Kara <jack@...e.cz>  2012-05-14 21:43:40 ---
(In reply to comment #8)
> Is there a way to find a cause of flush and jbd2 writes? Like apllication name
> or PID?
> Preferably without need to patch/compile new kernel, so that as many people as
> possible can use it.
  If you have tracepoints enabled in your kernel (they usually are) and you
have relatively recent kernel, then you can enable tracepoint in
ext4_mark_inode_dirty() by:
echo 1 >/sys/kernel/debug/tracing/events/ext4/ext4_mark_inode_dirty/enable

Then you can run:
cat /sys/kernel/debug/tracing/trace_pipe
and watch how inodes are dirtied. That should catch practically all cases where
JBD2 eventually ends up doing some IO.

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